X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail21.syd.optusnet.com.au ([211.29.133.158] verified) by logan.com (CommuniGate Pro SMTP 5.1c.5) with ESMTPS id 1455299 for flyrotary@lancaironline.net; Wed, 11 Oct 2006 03:40:00 -0400 Received-SPF: none receiver=logan.com; client-ip=211.29.133.158; envelope-from=lendich@optusnet.com.au Received: from george (d211-31-68-87.dsl.nsw.optusnet.com.au [211.31.68.87]) by mail21.syd.optusnet.com.au (8.12.11/8.12.11) with SMTP id k9B7dVpM019086 for ; Wed, 11 Oct 2006 17:39:33 +1000 Message-ID: <004701c6ed08$6834f460$57441fd3@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Exhaust Update Date: Wed, 11 Oct 2006 17:39:37 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0044_01C6ED5C.39034E90" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Antivirus: avast! (VPS 0641-1, 10/10/2006), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_0044_01C6ED5C.39034E90 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable David, Their talking about the inside of the flange. However when welding stainless and you want a smooth finish on the = inside of butt joint tube weld, purge the joint weld with ARGON. George ( down under) ----- Original Message -----=20 From: David Carter=20 To: Rotary motors in aircraft=20 Sent: Wednesday, October 11, 2006 2:42 PM Subject: [FlyRotary] Re: Exhaust Update How does a welder weld the "inside" of an exhaust pipe joint? Seems = like a long reach with tip of a long welding rod and a woefully small = angle for touching the seam to electricaly weld it. David ----- Original Message -----=20 From: Al Gietzen=20 To: Rotary motors in aircraft=20 Sent: Tuesday, October 10, 2006 8:41 AM Subject: [FlyRotary] Re: Exhaust Update >Just a heads up - it looks like your new "header flange to pipe" = (picture 5) was welded on the >outside. I think that 'acceptable = practices' state that there should only be a tack weld on the >outside = and the actual structural weld should be on the inside. What does = everyone else say? In >any event be sure to keep an eye on the welds. > >Ken Powell=20 It depends on the configuration. Generally, if are side loads due = to thermal stress, vibration, whatever; it is better to have a snug fit = of tube through the flange and weld on the inside. This reduces the = stress on the weld and can increase the reliability of the weld. The = key in either case is the quality of the weld and the heat treatment = after the weld. At least that's what I recall from my days as a practicing engineer. = Mine are welded on both sides. I'd prefer they were welded inside = only. Al ------=_NextPart_000_0044_01C6ED5C.39034E90 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
David,
Their talking about the inside of the=20 flange.
However when welding stainless and you = want a=20 smooth finish on the inside of butt joint tube weld, purge the joint=20 weld with ARGON.
George ( down under)
----- Original Message -----
From:=20 David=20 Carter
Sent: Wednesday, October 11, = 2006 2:42=20 PM
Subject: [FlyRotary] Re: = Exhaust=20 Update

How does a welder weld the "inside" = of an exhaust=20 pipe joint?  Seems like a long reach with tip of a long welding = rod and a=20 woefully small angle for touching the seam to electricaly weld=20 it.
 
David
----- Original Message -----
From:=20 Al = Gietzen=20
To: Rotary motors in = aircraft=20
Sent: Tuesday, October 10, = 2006 8:41=20 AM
Subject: [FlyRotary] Re: = Exhaust=20 Update

 

>Just a = heads up - it=20 looks like your new "header flange to pipe" (picture 5) was = welded on=20 the >outside.  I think that=20 'acceptable practices' state that there should only be a tack weld = on the=20 >outside and the=20 actual structural weld should be on the inside.  What does = everyone=20 else say?   In >any event be sure to keep an = eye on=20 the welds.

>
>Ken = Powell

It = depends on the=20 configuration.  Generally, if are side loads due to thermal = stress,=20 vibration, whatever; it is better to have a snug fit of tube through = the=20 flange and weld on the inside.  This reduces the stress on the = weld and=20 can increase the reliability of the weld.  The key in either = case is=20 the quality of the weld and the heat treatment after the=20 weld.

 

At = least that=92s=20 what I recall from my days as a practicing engineer.  Mine are = welded=20 on both sides.  I=92d prefer they were welded inside=20 only.

 

Al

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